Results of 1 - 10 of about 10 for Pointer (0.007 sec.)
- Vectors – DuckDB 12496
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...uckdb_validity_row_is_valid can be used to check whether or not a value is NULL . The duckdb_vector_get_validity returns a pointer to the validity mask. Note that if all values in a vector are valid, this function might return nullptr in which case the...ed as a duckdb_string_t . This is a special struct that stores the string inline (if it is short, i.e., <= 12 bytes ) or a pointer to the string data if it is longer than 12 bytes. typedef struct { union { struct { uint32_t length ; char prefix [ 4 ]; c...har * ptr ; } pointer ; struct { uint32_t length ; char inlined [ 12 ]; } inlined ; } value ; } duckdb_string_t ; The length can either be acces... - https://man.mtool.work/duckdb/1.3/clients/c/vector.html
- JSON Overview – DuckDB 11799
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...ry efficient format for tabular data, it is very commonly used, especially as a data interchange format. JSONPath and JSON Pointer Syntax DuckDB implements multiple interfaces for JSON extraction: JSONPath and JSON Pointer . Both of them work with the a...syntax because SQL is readily available for any further transformations. It's best to pick either the JSONPath or the JSON Pointer syntax and use it in your entire application. Indexing Warning Following PostgreSQL's conventions , DuckDB uses 1-based in...d[u]._\"ck"' AS v ; 42 Pages in This Section 関連キーワード json todos DuckDB JSONPath family format example anatidae auto Pointer Read options read table supports values manually Loading interchange uses used them support syntax based 関連するページ JS... - https://man.mtool.work/duckdb/1.3/data/json/overview.html
- Complete API – DuckDB 9671
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...destroy. duckdb_query Executes a SQL query within a connection and stores the full (materialized) result in the out_result pointer. If the query fails to execute, DuckDBError is returned and the error message can be retrieved by calling duckdb_result_er...ckdb_free . Syntax void * duckdb_malloc ( size_t size ); Parameters size : The number of bytes to allocate. Return Value A pointer to the allocated memory region. duckdb_free Free a value returned from duckdb_malloc , duckdb_value_varchar , duckdb_value...tring_t string ); Parameters string : The string to get the length of. Return Value The length. duckdb_string_t_data Get a pointer to the string data of a string_t Syntax const char * duckdb_string_t_data ( duckdb_string_t * string ); Parameters string... - https://man.mtool.work/duckdb/1.3/clients/c/api.html
- C++ API – DuckDB 8795
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...tion (this method only supports until ternary functions); name : is the name to register the UDF function; udf_func : is a pointer to the UDF function. This method automatically discovers from the template typenames the corresponding LogicalTypes: bool...es; ret_type : is the LogicalType of return of the function, which should match with the template TR type; udf_func : is a pointer to the UDF function. This function checks the template types against the LogicalTypes passed as arguments and they must ma...df_vectorized < int > ); con . Query ( "SELECT udf_vectorized_int(i) FROM integers" ) -> Print (); The Vectorized UDF is a pointer of the type scalar_function_t : typedef std :: function < void ( DataChunk & args , ExpressionState & expr , Vector & resu... - https://man.mtool.work/duckdb/1.3/clients/cpp.html
- Query – DuckDB 8616
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...be run in DuckDB from C. This method takes two parameters, a (null-terminated) SQL query string and a duckdb_result result pointer. The result pointer may be NULL if the application is not interested in the result set or if the query produces no result....esult ); duckdb_query Executes a SQL query within a connection and stores the full (materialized) result in the out_result pointer. If the query fails to execute, DuckDBError is returned and the error message can be retrieved by calling duckdb_result_er... - https://man.mtool.work/duckdb/1.3/clients/c/query.html
- Execution Format – DuckDB 8438
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...we make use of our string_t class. struct string_t { union { struct { uint32_t length ; char prefix [ 4 ]; char * ptr ; } pointer ; struct { uint32_t length ; char inlined [ 12 ]; } inlined ; } value ; }; Short strings ( <= 12 bytes ) are inlined into...the structure, while larger strings are stored with a pointer to the data in the auxiliary string buffer. The length is used throughout the functions to avoid having to call strlen and...having to continuously check for null-pointers. The prefix is used for comparisons as an early out (when the prefix does not match, we know the strings are not equal an... - https://man.mtool.work/duckdb/1.3/internals/vector.html
- ODBC 101: A Duck Themed Guide to ODBC – DuckDB 7901
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...e about ODBC. General Concepts Handles Connecting Error Handling and Diagnostics Buffers and Binding Handles A handle is a pointer to a specific ODBC object which is used to interact with the database. There are several different types of handles, each...scriptor handle. Handles are allocated using the SQLAllocHandle which takes as input the type of handle to allocate, and a pointer to the handle, the driver then creates a new handle of the specified type which it returns to the application. The DuckDB... - https://man.mtool.work/duckdb/1.3/guides/odbc/general.html
- Data Chunks – DuckDB 7383
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...lling this method, you must call duckdb_vector_get_validity and duckdb_vector_get_data to obtain current data and validity pointers Syntax void duckdb_data_chunk_reset ( duckdb_data_chunk chunk ); Parameters chunk : The data chunk to reset. duckdb_data_...s in the data chunk duckdb_data_chunk_get_vector Retrieves the vector at the specified column index in the data chunk. The pointer to the vector is valid for as long as the chunk is alive. It does NOT need to be destroyed. Syntax duckdb_vector duckdb_da... - https://man.mtool.work/duckdb/1.3/clients/c/data_chunk.html
- JSON Processing Functions – DuckDB 7204
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...produce an error when invalid JSON is supplied. We support two kinds of notations to describe locations within JSON: JSON Pointer and JSONPath. Function Description json_array_length(json[, path]) Return the number of elements in the JSON array json ,...sult will be LIST of types. json_valid(json) Return whether json is valid JSON. json(json) Parse and minify json . The JSONPointer syntax separates each field with a / . For example, to extract the first element of the array with key duck , you can do:... - https://man.mtool.work/duckdb/1.3/data/json/json_functions.html
- Table Functions – DuckDB 7025
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...nection con , duckdb_table_function function ); Parameters con : The connection to register it in. function : The function pointer Return Value Whether or not the registration was successful. duckdb_bind_get_extra_info Retrieves the extra info of the fu... - https://man.mtool.work/duckdb/1.3/clients/c/table_functions.html
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